Fuel injection nozzle for internal combustion engines



Aug.-21, 1934. M. HURST 1,970,301

FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES Filed April 8, 1933 Patented Aug. 21, 1934 PATENT OFFICE FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES Max Hurst,

Stuttgart,

Germany, assignor to Robert Bosch Aktiengesellschaft, Stuttgart,

Germany Application April 8, 1933, Serial No. 665,229 In Germany April 26, 1932 8 Claims.

The present invention relates to fuel injection nozzles for internal combustion engines, having spraying passages which do not coincide with the axis of the inserted nozzle.

In order to obtain a good engine capacity, it is often necessary to fit such injection nozzles in such a way that their injection passage or passages opens into the combustion chamber in a definite direction. This is however diflicult to attain with the known injection nozzles which screw into the cylinder head of the engine.

It has therefore already been proposed to fix the position of such injection nozzles by means of a pin, one end of which is inserted into the head of the cylinder and the other end into the body of the nozzle. It has been found, however, that the drilling of a pin-hole in the opening for the insertion of the nozzle in the cylinder head is diflicult and inconvenient. Furthermore, the fix- 20, ing pin is liable to be sheared off on screwing up the injection nozzle. A further drawback consists in the fact that the position of the injection nozzle cannot be subsequently altered, as is often desirable, for example, in view of the vary-- ing qualityor condition of the fuel to be sprayed.

The invention has for its object to provide a simple fixing arrangement for an injection nozzle of the kind already mentioned which is screwed into the cylinder head, and to enable the position of the spraying passage or passages inclined to the axis of the nozzle to be varied as required.

'According to the present invention, this is mainly efiected by that part of the nozzle containing the spraying passage or passages being so guided in a bushing which is capable of being fixed in the cylinder head in a suitable position relatively to the combustion chamber, that an undesired rotation of the nozzle and thus an alteration in position of the spraying passage or passages is prevented.

An example of construction of the object of the invention is shown in the accompanying drawing, in which:-

Figure 1 is a longitudinal median section through a so-called open injection nozzle screwed into the cylinder head of an engine.

Figure 2 is a cross-section on the line 2-2 of Figure 1. Figures 3 and 3a show two views of the fixing bushing, Fig. 3 being a side elevation and Fig. 3a

a top plan view of the bushing.

. 1 is the nozzle body, which has a central passage 3 extending nearly to the mouth of the nozzle. Fine spraying passages 4 branch of! from the bottom of this passage, the axes of which are inclined to the axis of the nozzle. The end of the nozzle body adjacent the combustion chamber is inserted in a bushing 5, which on one end has a flange or collar 6 which bears on the annular shoulder 7 of the insertion opening in the cylinder head. In order to prevent a turning of the nozzle body in the bushing 5, it is provided on its periphery with two projections 8, which engage in suitable axial slots 9 in the bushing. The bushing is retained in the insertion opening in the cylinder head by means of a screwed nipple 10, the end of which towards the working space of the engine bears against the collar 6 of the bushing and thereby presses this firmly against the annular shoulder 7. The screwed nipple lies completely in the cylinder head. In order to tighten or slacken this nipple, it is provided on its periphery with recesses 11 to permit the engagement of a socket wrench. The screwed nipple 10 has an internal thread12, in which is screwed a second nipple 13, which serves as a union or connection for the fuel supply pipe (not shown). This connection nipple bears with its hollow conical packing surface 15 tightly against the obtusely conical end of the nozzle body that is remote from the engine. After the removal of the connection nipple 13, the nozzle body 1 alone can be drawn out from the insertion opening in the cylinder head. As in doing so, the bushing 5 that serves for fixing and guiding the nozzle remains unaltered in position, the spraying passages 4 always come again into the same position relative to the combustion chamber on reinserting the nozzle. If it is desired for any reason to alter the position of the spraying holes, this is effected by rotating the bushing 5 within the cylinder head, for which purpose the screwed nipple 10 is previously slackened. As soon as the correct position is ascertained, the bushing 5, and thus the positionof the spraying holes, is again fixed by screwing up the screw nipple.

In order to facilitate the removal of the nozzle from the cylinder head, as in certain cases it may be burnt in, the end of the nozzle body 1 projecting from the cylinder head may be provided with an external thread 14, on which after removing the nipple 13 a withdrawing tool can be screwed.

I declare that what I claim is:

1. A fuel injection nozzle for internal combustion engines comprising a'guide member adapted to be fixed in an engine cylinder in any suitable angular position and a nozzle member having at least one non-axial spraying passage therein insertedin said guide member, said guide member and nozzle member being cooperatively formed for the insertion of said nozzle member in said thereon and a nozzle member having at least one non-axial spraying passage therein inserted in said guide member and havingjan abutment cooperating with said locating' abutment on the guide member to fix said nozzle member in angular position relatively to the guide member and to render said nozzle member capable of being withdrawn from the engine independently of said guide member.

3. A fuel injectionnozzle for internal combustion engines comprising a guide member adapted to be fixed in an engine cylinder in any suitable angular position and having a cylindrical wall which has at least one slot therein open at one end and a nozzle member having atleast one nonaxial spraying passage therein inserted in said guide member and having a projection adapted for engagement in said slot on the guide member to fix the same in position with respect to the guidemember and to render said nozzle member capable of beingwithdrawn from the engine independently of the guide member.

. 4. A fuel injection-nozzle for internal combustion engines comprising the combination, with an engine cylinder having a countersunk opening in its wall, of a flanged guide member inserted in said opening in the engine cylinder with its flange against the shoulder of said opening, said guide member being rotatably adjustable to any suitable angular position inthe mounting of the nozzle, a pressure memberhaving a. threaded engagement in said opening in the engine cylinder and pressing against said flange of the guide member to secure said guide member in position and a nozzle member having at least one nonaxial spraying passage therein inserted in said guide member, said guide member and said nozzle member being cooperatively formed for the insertion of said nozzle member in said guide member only in a predetermined fixed angular position relative thereto and for the withdrawal of said nozzle member-from the engine independently of said guide member;

5. A fuel injection device for internal combustion engines comprising the combination, with an engine cylinder having a counter-sunk opening in its wall, of a flanged guide member inserted in said opening in the engine cylinder with its flange against the shoulder of said opening, .said guide member being rotatably adjustable to any suitable angular positioninthe; mounting of the device, a pressure member having a threaded engagement in said opening in the cylinder and pressing against the flange .otthe guide member to secure the same in position and having internal threads at one end thereof, a nozzle member having at least one non-axial spraying passage therein inserted in said guide member, said guide member and said nozzle member being cooperatively formed for the insertion of said nozzle member in said guidemember only in a predetermined fixed angular position relative thereto and for the withdrawal of said nozzle member from the engine independentlyof said guide member, and a nipple removably engaging over said nozzle member and into threaded engagement with the internal. threads of said pressure member to removably secure said nozzle member in said guide member.

6. A fuel injection device as defined in claim 5 and in which said nozzle member has a packing surface at its end remote from the spraying passage and in which said nipple has a packing surface in sealing engagement with the packing surface of said nozzle member.

'7; A fuel injection nozzle for internal combustion engines comprising the combination, with an engine cylinder having a counter-sunk opening in its wall, of a guide member having a flange at one end inserted in said opening in the engine cylinder with its flange against the shoulder of said opening, said guide member being rotatably adjustable to any suitable angular position in the mounting of said nozzle, a pressure member having a threaded engagement in said opening in the engine cylinder and pressing against said flange of the guide member to secure the same in position and a nozzle member having at least one non-axial spraying passage therein inserted in said guide member in a flxed angular position relatively thereto and capable of being withdrawn from the engine independently of the guide member, said nozzle member having external screw threads adjacent its end remote from the spraying opening to assist in removal of the nozzle member from the engine.

8. A fuel injection nozzle for internal combustion engines comprising the combination, with an engine cylinder having a counter-sunk opening in its wall, of a guide member having a flange at one end inserted in said opening in the engine cylinder with its flange against the shoulder of said opening, said guide member being rotatably adjustable to any suitable angular position in the mounting of said nozzle, a pressure member hav} ing a threaded engagement in said opening in the engine cylinder and pressing against said flange of the guide member to secure the same in position and a nozzle member having at least one non-axial spraying passage therein inserted in said guide member in a flxed angular position relatively thereto and capable of being withdrawn from the engine independently of the guide member, said pressure member being entirely housed in said opening in the cylinder and provided with an upper rim portion having recesses for engagement by a socket spanner.

MAX BURST. 

